I'm assuming you're referring to the popular chemistry textbook "General Chemistry" by John A. Petrucci, and you're looking for a draft piece related to the topic.
The equilibrium constant expression is a mathematical representation of the law of mass action. For the reaction: petrucci genel kimya 2 pdf
Chemical equilibrium is a fundamental concept in chemistry that describes the state of a system where the concentrations of reactants and products no longer change over time. This occurs when the rates of forward and reverse reactions are equal, and the system reaches a stable balance. I'm assuming you're referring to the popular chemistry